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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9bf02605cac3cf1e2f2547ad3aa3fb25a5cecb310e221d2485a4fec14d49a65d' 
  AND token = '61x5eZwOr0MvVbnZvYSExLC68qhUwO7fGBWeVVQRsrU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00058

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}